.gitlab-ci.yml

--- 
image: docker:latest

services:
  - docker:dind

stages:
  - build
  - test
  - push

variables:
  DOCKER_PASSWORD: "${CI_REGISTRY_PASSWORD}"
  DOCKER_REGISTRY: "${CI_REGISTRY}"
  DOCKER_USERNAME: "${CI_REGISTRY_USER}"
  PROJECT_NAME: "${CI_PROJECT_NAME}"
  PROJECT_OWNER: "${GITLAB_USER_LOGIN}"
  WORKING_DIR: "/builds/${GITLAB_USER_LOGIN}/${CI_PROJECT_NAME}"

before_script:
  - apk add acl bash git make openssh-client
  - git checkout ${CI_COMMIT_REF_NAME}
  - git branch -u origin/${CI_COMMIT_REF_NAME} || true
  - git config branch.${CI_COMMIT_REF_NAME}.remote origin || true
  - git config branch.${CI_COMMIT_REF_NAME}.merge refs/heads/${CI_COMMIT_REF_NAME} || true
  - git config --unset remote.origin.fetch
  - git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/*
  - git fetch origin master
  - make login

build:
  stage: build
  script:
    - make pull_or_build_if_changed
    - make push

test:
  stage: test
  script:
    - make pull
    - make clean
    - docker info
    - id
    - make bundle
    - make run
    - make test

push:
  stage: push
  only:
    - bootstrap
    - master
  script:
    - make pull_then_push_to_latest
...